FCM120 - DHT22.ino

// DHT Temperature & Humidity Sensor
// Unified Sensor Library Example
// Originally Written by Tony DiCola for Adafruit Industries
// Released under an MIT license.
// Modified by G.D. Walters for Full Circle Magazine
// April, 2017

// Depends on the following Arduino libraries:
// - Adafruit Unified Sensor Library: https://github.com/adafruit/Adafruit_Sensor
// - DHT Sensor Library: https://github.com/adafruit/DHT-sensor-library

#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <DHT_U.h>

#define DHTPIN            4         // Pin which is connected to the DHT sensor.

// Uncomment the type of sensor in use:
//#define DHTTYPE           DHT11     // DHT 11
#define DHTTYPE           DHT22     // DHT 22 (AM2302)
//#define DHTTYPE           DHT21     // DHT 21 (AM2301)

// See guide for details on sensor wiring and usage:
//   https://learn.adafruit.com/dht/overview

DHT_Unified dht(DHTPIN, DHTTYPE);

uint32_t delayMS;

void setup() {
  Serial.begin(9600);
  // Initialize device.
  dht.begin();
  Serial.println("DHTxx Unified Sensor Example");
  // Print temperature sensor details.
  sensor_t sensor;
  dht.temperature().getSensor(&sensor);
  Serial.println("------------------------------------");
  Serial.println("Temperature");
  Serial.print  ("Sensor:       "); Serial.println(sensor.name);
  Serial.print  ("Driver Ver:   "); Serial.println(sensor.version);
  Serial.print  ("Unique ID:    "); Serial.println(sensor.sensor_id);
  Serial.print  ("Max Value:    "); Serial.print(sensor.max_value); Serial.println(" *C");
  Serial.print  ("Min Value:    "); Serial.print(sensor.min_value); Serial.println(" *C");
  Serial.print  ("Resolution:   "); Serial.print(sensor.resolution); Serial.println(" *C");
  Serial.println("------------------------------------");
  // Print humidity sensor details.
  dht.humidity().getSensor(&sensor);
  Serial.println("------------------------------------");
  Serial.println("Humidity");
  Serial.print  ("Sensor:       "); Serial.println(sensor.name);
  Serial.print  ("Driver Ver:   "); Serial.println(sensor.version);
  Serial.print  ("Unique ID:    "); Serial.println(sensor.sensor_id);
  Serial.print  ("Max Value:    "); Serial.print(sensor.max_value); Serial.println("%");
  Serial.print  ("Min Value:    "); Serial.print(sensor.min_value); Serial.println("%");
  Serial.print  ("Resolution:   "); Serial.print(sensor.resolution); Serial.println("%");
  Serial.println("------------------------------------");
  // Set delay between sensor readings based on sensor details.
  delayMS = sensor.min_delay / 1000;
}

void loop() {

  handleSerial();

}

void handleSerial() {
    while (Serial.available() > 0) {
        char inChar = Serial.read();
        switch (inChar) {
            case 'T':
            case 't':
                // get temp
                sensors_event_t event;
                dht.temperature().getEvent(&event);
                if (isnan(event.temperature)) {
                    Serial.println("Error reading temperature!");
                }
                else {
                    Serial.print("Temperature: ");
                    Serial.print(event.temperature);
                    Serial.print(" *C - ");
                    Serial.print((event.temperature * 1.8) + 32);
                    Serial.println(" *F");
                }
                // Delay between measurements.
                delay(delayMS);
                break;
            case 'H':
            case 'h':
                // get humidity
                dht.humidity().getEvent(&event);
                if (isnan(event.relative_humidity)) {
                    Serial.println("Error reading humidity!");
                }
                else {
                    Serial.print("Humidity: ");
                    Serial.print(event.relative_humidity);
                    Serial.println("%");
                }
                // Delay between measurements.
                delay(delayMS);
                break;
            default:
                break;
        }
    }
}